<?php // $Id: view_statement_xml.class.php,v 1.4 2007/10/10 05:25:31 nicolasconnault Exp $

///////////////////////////////////////////////////////////////////////////
//																	   //
// NOTICE OF COPYRIGHT												   //
//																	   //
// Moodle - Modular Object-Oriented Dynamic Learning Environment		 //
//		  http://moodle.com											//
//																	   //
// Copyright (C) 1999 onwards Martin Dougiamas		http://dougiamas.com  //
//		   (C) 2001-3001 Eloy Lafuente (stronk7) http://contiento.com  //
//																	   //
// This program is free software; you can redistribute it and/or modify  //
// it under the terms of the GNU General Public License as published by  //
// the Free Software Foundation; either version 2 of the License, or	 //
// (at your option) any later version.								   //
//																	   //
// This program is distributed in the hope that it will be useful,	   //
// but WITHOUT ANY WARRANTY; without even the implied warranty of		//
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the		 //
// GNU General Public License for more details:						  //
//																	   //
//		  http://www.gnu.org/copyleft/gpl.html						 //
//																	   //
///////////////////////////////////////////////////////////////////////////

/// This class will display the XML for one statement being edited

class view_statement_xml extends XMLDBAction {

	/**
	 * Init method, every subclass will have its own
	 */
	function init() {
		parent::init();

	/// Set own custom attributes

	/// Get needed strings
		$this->loadStrings(array(
		/// 'key' => 'module',
		));
	}

	/**
	 * Invoke method, every class will have its own
	 * returns true/false on completion, setting both
	 * errormsg and output as necessary
	 */
	function invoke() {
		parent::invoke();

		$result = true;

	/// Set own core attributes
		$this->does_generate = ACTION_GENERATE_XML;

	/// These are always here
		global $CFG, $XMLDB;

	/// Do the job, setting result as needed

	/// Get the file parameter
		$statement =  required_param('statement', PARAM_CLEAN);
		$select = required_param('select', PARAM_ALPHA); //original/edited
	/// Get the dir containing the file
		$dirpath = required_param('dir', PARAM_PATH);
		$dirpath = $CFG->dirroot . stripslashes_safe($dirpath);

	/// Get the correct dir
		if ($select == 'original') {
			if (!empty($XMLDB->dbdirs)) {
				$base =& $XMLDB->dbdirs[$dirpath];
			}
		} else if ($select == 'edited') {
			if (!empty($XMLDB->editeddirs)) {
				$base =& $XMLDB->editeddirs[$dirpath];
			}
		} else {
			$this->errormsg = 'Cannot access to ' . $select . ' info';
			$result = false;
		}
		if ($base) {
		/// Only if the directory exists and it has been loaded
			if (!$base->path_exists || !$base->xml_loaded) {
				$this->errormsg = 'Directory ' . $dirpath . ' not loaded';
				return false;
			}
		} else {
			$this->errormsg = 'Problem handling ' . $select . ' files';
			return false;
		}

	/// Get the structure
		if ($result) {
			if (!$structure =& $base->xml_file->getStructure()) {
				$this->errormsg = 'Error retrieving ' . $select . ' structure';
				$result = false;
			}
		}
	/// Get the statements
		if ($result) {
			if (!$statements =& $structure->getStatements()) {
				$this->errormsg = 'Error retrieving ' . $select . ' statements';
				$result = false;
			}
		}
	/// Get the statement
		if ($result && !$t =& $structure->getStatement($statement)) {
			$this->errormsg = 'Error retrieving ' . $statement . ' statement';
			$result = false;
		}

		if ($result) {
		/// Everything is ok. Generate the XML output
			$this->output = $t->xmlOutput();
		} else {
		/// Switch to HTML and error
			$this->does_generate = ACTION_GENERATE_HTML;
		}

	/// Return ok if arrived here
		return $result;
	}
}
?>
